Hi guys, I can't see this reported elsewhere, so maybe it's something new.
A friend of mine has this problem, but I had her send me the calibre subdirectory and imported it to my calibre library, and I can replicate the problem.
So, she has a series of 15 books, all with their corresponding metadata filled correctly. They are all part of a series she named "La Confraternita del Pugnale Nero", each numbered with a series index from 1 to 15.
Calibre shows there is only one series called "La Confraternita del Pugnale Nero", so it's not a case of two different series with a similar name... (see series.jpg)
Now, if she displays the whole library, and she sorts by the "Series" column... Some of the books are listed under the "C" letter; some other under the "L" letter (see pictures series_list_C.jpg and series_list_L.jpg)!!!
How the heck is this possible?
Also, if she filters by series, and choose to display only the books in the series, sorting by the series... All the books are displayed, but their order is wrong.
She sees, book number 1, 2, 3, 4, 6, 8, 10, 11 and then 5, 7, 9, 12, 13, 14, 15 (see picture series_sort.jpg)
I had her send me the books (her whole calibre subdirectory, actually) and imported the books in my calibre library, and the problem is reproducible.
What is utterly strange is that if you use "Manage Series" and choose to rename the series name in all the books with anything else: "Weird series behaviour", or "Confraternita Pugnale Nero" for what matters, everything works just fine. If you rename the series back to "La Confraternita del Pugnale Nero", the problem reappears again.
I swear this goes beyond my understanding. Can you help me find an explanation for this?